Organic Light Emitting Device Using Specific Compounds for Low Driving Voltage
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Solution Overview
Problem
There is a continuous need for organic light emitting devices with improved driving voltage, efficiency, and lifetime, as existing devices face limitations in these areas.
Innovation Solution
The organic light emitting device incorporates a light emitting layer with specific compounds represented by Chemical Formulas 1 and 2, which enhance the device's efficiency and longevity by optimizing the materials used in the light emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If conventional organic material layers are used, then the device can be manufactured with standard materials, but the driving voltage is high and efficiency is limited
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compounds in the light emitting layer. Specifically, it uses compounds with particular molecular weights (200-500 Daltons), specific HOMO/LUMO energy levels, and defined structural features (aromatic rings, heteroatoms) to optimize electron-hole recombination efficiency, thereby reducing driving voltage while maintaining device stability and lifetime
Solution Approach 2:
The patent employs composite organic materials in the light emitting layer, combining multiple compounds with complementary properties. The composition includes host materials, guest materials, and auxiliary compounds in specific weight ratios (e.g., 90:5:5 or 80:10:10), creating a synergistic system that improves efficiency, reduces driving voltage, and enhances device lifetime simultaneously
2Productivity
If the light emitting layer uses multiple host compounds, then efficiency can be improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific functional roles to different compounds within the light emitting layer. The host material provides the primary matrix, guest materials provide specific emission characteristics, and auxiliary compounds enhance stability or charge transport. Each component has optimized local properties (molecular weight, energy levels, structural features) tailored to its specific function, achieving high efficiency without requiring complex overall device architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The inclusion of these compounds in the light emitting layer results in improved efficiency and reduced driving voltage, thereby extending the device's lifetime and performance.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
Figure 1~2
AI summary
The present disclosure relates to relates to an organic light emitting device having improved driving voltage, efficiency and lifetime.